Fastin, which is the brand name for the medication phentermine, is a diet pill that helps suppress the appetite in order for an obese person to lose weight. The medication is only available by prescription. After a few weeks of use, the positive effects of the medication begin to decrease. When used in combination with diet and exercise, a person may continue to lose weight after taking Fastin if the positive lifestyle changes continue. In addition to the positive effects of Fastin, the medication may cause unpleasant adverse reactions.
Step 1
Read the directions on the bottle of Fastin and review the directions given by the physician or pharmacist.
Step 2
Swallow a 30 mg Fastin capsule whole on an empty stomach about two hours following breakfast, according to RxList.com. Do not open, crush or alter the pill. Do not take the medication within 10 to 14 hours of bedtime because it may interfere with sleep.
Step 3
Take the medication for the duration prescribed by the doctor and not longer. Most physicians prescribe using Fastin for only a few weeks at a time, according to Drugs.com.
Step 4
Avoid skipping doses of Fastin. If you miss a dose, go ahead and take it as soon as possible, but if the dose falls too close to the next dose or too close to bedtime, skip the missed dose and take the next dose as scheduled. Do not double the dose to try to make up the missed medication.
Step 5
Avoid taking Fastin with other diet medications that contain fenfluramine or dexfenfluramine. The combination of these medications may cause a fatal lung disorder, called pulmonary hypertension.
Step 6
Watch for side effects associated with taking Fastin. The medication may cause side effects such as anxiety, insomnia, changes in bowel habits, such as diarrhea or constipation, headache and a dry mouth. Report any serious or bothersome side effects to the physician. Symptoms of an allergic reaction include difficulty breathing, swelling of the airway and hives. These symptoms signify a medical emergency.
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